Plutarch, De Iside et Osiride
Goodwin, Ed.

But when Isis came to her son Horus, who was then at nurse at Buto, and had laid the chest out of the way, Typhon, as he was hunting by moonshine, by chance lighted upon it, and knowing the body again, tore it into fourteen parts, and threw them all about. Which when Isis had heard, she went to look for them again in a certain barge made of papyrus, in which she sailed over all the fens. Whence (they tell us) it comes to pass, that such as go in boats made of this rush are never injured by the crocodiles, they having either a fear or else a veneration for it upon the account of the goddess Isis. And this (they say) hath occasioned the report that there are many sepulchres of Osiris in Egypt, because she made a particular funeral for each member as she found them. There are others that tell us it was not so, but that she made several effigies of him and sent them to every city, taking on her as if she had sent them his body; so that the greater number of people might pay divine honors to him, and withal, if it should chance that Typhon should get the better of Horus, and thereupon search for the body of Osiris, many bodies being discoursed of and shown him, he might despair of ever finding the right one. But of all Osiris's members, Isis could never find out his private part, for it had been presently flung into the river Nile, and the lepidotus, sea-bream, and pike eating of it, these were for that reason more scrupulously avoided by the Egyptians than any other fish. But Isis, in lieu of it, made its effigies, and so consecrated the phallus for which the Egyptians to this day observe a festival.